Method for filtering noise of lens operation and video recording system

Abstract

A method for filtering noise of lens operation is applicable to a controller being communicably connected with a video recorder. The method includes: sending, by the controller, a recording instruction configured to control the video recorder to perform a video recording and an audio recording; sending, by the controller, a lens operation instruction configured to control a lens of the video recorder to perform an operation; reading, by the controller, an inverted noise signal associated with the operation receiving, by the controller, an audio recording signal generated by the video recorder when the video recorder performs the operation; and synthesizing, by the controller, the audio recording signal and the inverted noise signal to output a synthesized audio signal.

What is claimed is: 
     
       1. A method for filtering noise of lens operation applicable to a controller and a video recorder comprising:
 establishing, by the controller, a connection between the controller and the video recorder; 
 receiving, by the video recorder, a recording instruction configured to control the video recorder to perform a video recording and control a microphone of the video recorder to generate an audio recording signal; 
 controlling, by the controller, the video recorder to enter an audio monitor mode after the video recorder performs the video recording; 
 in the audio monitor mode, determining, by the video recorder, whether the video recorder receives a lens operation instruction, and sending, by the video recorder, a notification signal when the video recorder receives the lens operation instruction, wherein the lens operation instruction is configured to control a lens of the video recorder to perform an operation; 
 after receiving the notification signal by the controller, reading, by the controller, an inverted noise signal associated with the operation and sending, by the controller, a permission signal to the video recorder; and 
 after receiving the permission signal by the video recorder, performing, by the video recorder, the operation according to the lens operation instruction and receiving, by the controller, the audio recording signal. 
 
     
     
       2. The method for filtering noise of lens operation of  claim 1  further comprising:
 obtaining, by the controller, a model number of the video recorder after the connection is established; 
 wherein reading, by the controller, the inverted noise signal associated with the operation comprises: selecting, by the controller, one of a plurality of candidate inverted noise signals according to the model number. 
 
     
     
       3. The method for filtering noise of lens operation of  claim 1 , wherein the notification signal has a category of the lens operation instruction, and reading, by the controller, the inverted noise signal associated with the operation comprises:
 selecting, by the controller, one of a plurality of candidate inverted noise signals according to the category, wherein the category comprises a scaling operation and a focusing operation. 
 
     
     
       4. A video recording system comprising:
 a video recorder comprising lens performing a video recording and a microphone performing an audio recording to generate an audio recording signal; and 
 a controller comprising:
 a communication circuit communicably connected to the video recorder; 
 a storage circuit storing an inverted noise signal and a plurality of instructions; and 
 a processor electrically connected to the communication circuit and the storage circuit, wherein the processor is configured to perform one of the plurality of instructions or control the communication circuit to send one of the plurality of instructions, and the plurality of instructions comprises:
 a recording instruction being sent to the video recorder through the communication circuit to control the video recorder to perform a video recording and an audio recording; 
 a lens operation instruction being sent to the video recorder through the communication circuit to control the lens of the video recorder to perform an operation; and 
 
 
 a synthesizing instruction performing by the processor to read the inverted noise signal and synthesizing the audio recording signal and the inverted noise signal to output a synthesized audio signal; 
 wherein the video recorder further comprises: 
 a trigger circuit detecting a triggering operation; 
 a communication circuit sending the audio recording signal and a notification signal and receiving a permission signal; and 
 a control circuit electrically connected to the trigger circuit and the communication circuit, wherein:
 the control circuit controls the communication circuit to send the notification signal to the controller when the trigger circuit detects the triggering operation; and 
 the control circuit controls the video recorder to perform the operation according to the lens operation instruction when the communication circuit receives the permission signal. 
 
 
     
     
       5. The video recording system of  claim 4 , wherein the plurality of instructions further comprises a model-number detecting instruction driving the controller to detect a model number of the video recorder, and the model number is associated with the inverted noise signal.